Descriptive Statistics Flashcards
def inferential stats
concerned with pops and use sample data to make an inference abt a pop
def descriptive statistics
stats that organize abd summarize numerical data gathred from samples
descriptive statistics allow the researcher to….
examine the char, behaviors, and experiences of study participants
categorizing descriptive stats
measures to condense data
measures of central tendency
measures of variability
measures of r/ships
def measures to condense data
stats used to summarize and condense data
what are the various waya to condense or summarize data?
freq distributions
graphic presentations
percentages
freq distrubutions are appropriate for which kind of data
nominal
ordinal
interval
ratio
def freq distribution
all values/scores are listed and the number of times each one appears is recorded
highest to lowest or vice versa
methods of freq distributions
slash method
class intervals
skews
symmetrical distributions
both halves of the distribution are the same
def non symmetrical distribution
aka skewed
def positively skewed
tail points to the right
negatively skewed
tail points to the left
def normal distribution
a symmetrical distribution that has one central peak or set of values in the middle of the distribution
def normal curve
a bel shaped curve that graphically presents a normal distribution
aka Gaussian curve
name graphic presentations
bar graph
histogram
freq polygon
def percentage
a stat that rep the prop of a subgroup to a total group, epressed as a percentage ranging from 0-100.
def Measures of Central Tendency
stats that describe the avg, typical, or most common value for a group of data
what value sare important in the measures of central tendency
mean
median
mode
def measures of variability
describes how spread out the values are in a distribution of values
def interquartile range
the middle half of the values in a freq distribution
def percentile
a datumpoint below which lies a certain percentage of the values in a freq distribution
def standard deviation
a measurement that indicates the avg deviation or variation of all the values in a set of values from the mean value of those data
def variance
a measure that is used in several inferential statistical tests
def z score
a standard score that indicates how mandy SD’s from the mean a particular value lies
coefficient of determination formula
r 2 (squared)
def contingency tables
aka cross tabulation table
a visual means of displaying the rship bx sets of nominal data
